The first thing you should take into account is that you can post three types of posts on LinkedIn: Text, Image, Video, and Link. Also, keep in mind that your posts can have up to 3000 characters and you can add up to 9 images per post.
Sum up
Text Posts: Yes
Max. characters: 3000
Hashtag Limit: No
Image Posts: Yes
Multi-Image Posts: Yes
Max. Images per post: 9
Link Posts: Yes
Link Editing: No
Video Posts: Yes (up to 200mb)
Mentions: No